USDA Confirms First Bird Flu Case in Indiana Dairy Herd, Expanding Outbreak to 21 States
The U.S. Department of Agriculture’s (USDA) Animal and Plant Health Inspection Service (APHIS) has confirmed the first case of highly pathogenic avian influenza (HPAI) H5N1, genotype B3.13, in a dairy cattle herd in Indiana. This detection, made through PCR testing by APHIS’s National Veterinary Services Laboratories, adds Indiana to the growing list of states affected by the outbreak, bringing the total to 21. The specific H5N1 lineage, genotype B3.13, has been circulating in U.S. dairy cattle since March 2024. The virus was identified via the National Milk Testing Strategy, a nationwide program that screens bulk raw milk, rather than through reported clinical signs from producers or state veterinarians. APHIS is collaborating with the Indiana State Board of Animal Health to investigate how the virus reached the herd.